The Nikon D810 is a full-frame digital SLR that features 36.3 megapixel FX-format CMOS sensor (without an optical low-pass filter) along with Nikon's latest EXPEED 4 image processing engine. The EXPEED 4 improves performance and image quality and also offers an ISO range of 64 to 12800, which expands to 32 to 51200. There's also a new RAW Small Size option, which produces 16MP images with much smaller file sizes. The shutter mechanism has been redesigned and a first curtain electronic shutter added in order to reduce the risk of 'shutter shake'. On the video front, the D810 offers full HD recording at 1080/60p/24p with manual exposure control, focus peaking and zebra pattern, manual exposure control, and audio level adjustment. New features include uncompressed HDMI output with simultaneous recording to a memory card, a new 'flat' Picture Control (designed with post-production in mind), highlight weighted metering, and Auto ISO in manual mode.